10 Dollars - Elizabeth II Posthumous, Aztec Gold

A 45mm coin weighing 0.31 grams is not a conventional gold coin — the geometry alone tells you this is foil-layered or color-printed base metal with gold content measured in fractions of a troy grain, a format pioneered by the Perth Mint and now mass-produced for the commemorative market. Solomon Islands has issued sovereign face values on hundreds of such pieces since the early 2000s, lending legal-tender status to items manufactured primarily in Poland and China for direct-to-collector sales.

Elizabeth II died on 8 September 2022; this posthumous attribution makes it among the first wave of issues bearing her image after the accession of Charles III.